11. This reservation needs to be made in respect to the unrestricted submarine warfare only. 12. Unrestricted submarine warfare made aircraft more important than ever in the war against the U-Boats.13. He was a vocal proponent of unrestricted submarine warfare . 14. Late in October, Germany discontinued unrestricted submarine warfare and, early in November, sued for peace. 15. In January 1917 the German Government announced it would now conduct full unrestricted submarine warfare . 16. For Germany, it was unrestricted submarine warfare . 17. Unrestricted submarine warfare in early 1917 was initially very successful, sinking a major part of Britain-bound shipping.18. The first was the use of unrestricted submarine warfare to cut off Allied supplies arriving from overseas. 19. Unrestricted submarine warfare was resumed in February 1917 and the British began full-scale convoying in September 1917.20. German planners estimated that unrestricted submarine warfare would cost Britain a monthly shipping loss of 600, 000 tons.
